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common wire

[ kom-uhn wahyuhr ]

noun

, Electricity.
  1. a separate or extra wire serving to supply a smart thermostat with continuous power from a heating or cooling system, without interfering with the signals that alert the system to turn the heating or cooling on or off.


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Word History and Origins

Origin of common wire1

First recorded in 1870–75

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Commonwealth of Nationscommon year